Updating xfail reason for tests currently failing due to instance spawning with null renderer

Signed-off-by: jckand-amzn <jckand@amazon.com>

AutomatedTesting/Gem/PythonTests/largeworlds/dyn_veg/test_AltitudeFilter.py

@@ -84,7 +84,7 @@ class TestAltitudeFilter(object):
     @pytest.mark.test_case_id("C4847478")
     @pytest.mark.SUITE_periodic
     @pytest.mark.dynveg_filter
-    @pytest.mark.xfail  # LYN-3275
+    @pytest.mark.xfail(reason="https://github.com/o3de/o3de/issues/2303")
     def test_AltitudeFilter_FilterStageToggle(self, request, editor, level, workspace, launcher_platform):
         cfg_args = [level]
 

AutomatedTesting/Gem/PythonTests/largeworlds/dyn_veg/test_LayerSpawner.py

@@ -100,7 +100,7 @@ class TestLayerSpawner(object):
     @pytest.mark.test_case_id("C4765973")
     @pytest.mark.SUITE_periodic
     @pytest.mark.dynveg_misc
-    @pytest.mark.xfail      # LYN-3275
+    @pytest.mark.xfail(reason="https://github.com/o3de/o3de/issues/2303")
     def test_LayerSpawner_FilterStageToggle(self, request, editor, level, workspace, launcher_platform):
 
         expected_lines = [

AutomatedTesting/Gem/PythonTests/largeworlds/dyn_veg/test_PositionModifier.py

@@ -58,7 +58,7 @@ class TestPositionModifier(object):
     @pytest.mark.test_case_id("C4874100")
     @pytest.mark.SUITE_periodic
     @pytest.mark.dynveg_modifier
-    @pytest.mark.xfail      # LYN-3275
+    @pytest.mark.xfail(reason="https://github.com/o3de/o3de/issues/2303")
     def test_PositionModifier_AutoSnapToSurfaceWorks(self, request, editor, level, launcher_platform):
 
         expected_lines = [

AutomatedTesting/Gem/PythonTests/largeworlds/dyn_veg/test_SlopeFilter.py

@@ -68,7 +68,7 @@ class TestSlopeFilter(object):
     @pytest.mark.test_case_id("C4814464", "C4874096")
     @pytest.mark.SUITE_periodic
     @pytest.mark.dynveg_filter
-    @pytest.mark.xfail      # LYN-3275
+    @pytest.mark.xfail(reason="https://github.com/o3de/o3de/issues/2303")
     def test_SlopeFilter_ComponentAndOverrides_InstancesPlantOnValidSlopes(self, request, editor, level,
                                                                            launcher_platform):